Insulator.



PATENTED MAR. 24, 1908. L. W. STORROR.

INSULATOR.

APPLICATION FILED mm2, 1906.

I LEONARD W. STORROR, OF SAN FRANCISCO, CALIFORNIA.

INSULATOR.

Specification ot Letters Patent.

Patented March 24, 1908.

Application tiled January 2, 1906. Serial No. 294,099.

To all'wfiqmy it may concern:

Be it known that ILLEONARD W. S'roRnon., a citizen of the United States,and resident of the city and county of San Francisco, State ofCalifornia, have invented certain new and useful ImprovementsinInsulators, of which a high standard.

the following is a s cification.I

Insulators are subect toileakage over their surfaces. This leakage iscaused by moisture and deposition of foreign substances from the air.The deposition in 'time completely coats the surface with a layer ofincreasing thickness progressivel impairing the insulating powerof theinsu ator. l- Various ,devices have been tried to overcome this defect,none of which however have met with any large measure of success. Oil incups has been used; but the surface of the oil becomes covered with dustin the same manner as the surface of glass and porcelain. The Wind andcapillarity tend to coat the insulator surfaces with the oil placed inthe cups, and thus to aid the adhesion of dust and dirt thereto.

Petticoats were added on insulators and con-- tinuously multiplied.Insulators were added to one another.

The object aimed at has been toshed rain and keep dry the under surfaceof the insu-4 lator. But they all fail to do this, since the windcarries fumes and dust to the underside,

and the carbon, creosote, and oil in the smoke which the air carries,attach themselves thereto aswell as to the other parts. Capillarityattracts lthe moisture of fog and rain into the area of the undersurface from the drip edges of insulators, and practice shows.

that the only good done by multiplying petticoats is, in increasing thedistance which the current has to travel lfrom the tie Wire to brokenzone of dryness and cleanliness, the

insulating propert thereof is maintained at t does not matter Whetherthis zoneis on the lower surface or on the sisting the leakage effectsof fog, moisture and other substances.

A second objectof my invention is to provide an insulating device havinmeans of cleanliness .around about the space between the tie-wire andthe pin.

A third object of my invention is to provide an insulating device havinga covering adapted to protect part of the surface ,thereof fromdeposition of moisture and other substances.

Other objects will appear in the subjoined description of my inventionwhich is illustrated by the drawing accompanying this specification andforming part hereof.

Said drawing is a vertical central sectional view of my insulatingdevice, showing the f pin for supporting the same.

My device is primarily divisible into two parts, an upper 1, and a lower6. Both parts are constructed of/ highly insulatingmaterial as glass orporcelain, and are separated froln each other by air spaces. It is'to beunderstood, however, that the separation single device embodying theprinciple of my twoV part insulator, is also contemplated by me. The pin5 may bean iron pin, having an insulating or partially insulating screwto support my insu ator; or it may be an ordinary wooden pin with orwithout a covering of highly insulating substance. Upper part 1 `of mydevice may take any of the forms suitable for an insulator.

,The outer petticoat is shown at 2 and the inner petticoat at 3. Thegroove for suspendin the line wire is shown at 4, but it is to be unerstood that the wire suspending means may be situated at any otherdesirable position, as at the tcp.

hat part of the surface of the insulator which is affected by leakagelies between groove 4 and the pin 5.4 Attention is called totheconstruction of such insulators as' They form a in` 5. Even where acombination of insuators of many petticoats is used, as in somemaintaining a complete' zone of ryness and vis for constructive reasonsonly, and that a Y ofthe recentiinsulating for sion circuits, thepetticoats are all related to Athe Vbodyv of the insulator'jin themanner 'above described, and the separate insulators ig?- lnotconjectural; but have tested it-forf-"a time sufficient to cover thicklywith a carbon deposit-the' outersurface of part 1,`and'to..Y

' 5 are similarlyjrelated. l The condition will be somedegree theinnersurface of'petticoat 2, andthatpart-of the surface of lower part 6adjacent to petticoat 2 while petticoat 3 re. mained dry and'clean.- f lThe ange or collar 8 is 1 made heavy enough to support lower part 6' onpin 5. s aforesaid it is best to make lower. part 6 Vof.insulating-material. The reason for making it of such material is tolessen leakagefeflects caused byv possible 'connections between. the

Attentionisnow directed to the'lowe'rpart 6 of my device. A s shown inthe drawing it comprises a body and franges or petticoats.

The petticoats are arra ed` to partially fill the interspacesbetweenltIi per part 1 .A but leaving an air s ace between e petticcatsof .up-

their res ective surfaces. he drawing shows the` ower 'part fittedtocoperate with a doublefpetticoat 1nsulator. Insulators of othershapes'would have corresponding'lowei parts, partially filling theintersiraces beL tween their petticoats, and` partial By the illustratedevice-part of the surface of upper part'l is kept away from thebeforedescribed straight lineconmunication with the air. `This pait' inthe drawing is the petticoat 3, the surface of whichis protected ontwosides by the lower part 6. vThe protection consists in making thepath of the air from the atmosphere to the part 3 a tortuous one, and'of making-the air space between the surface of said lower part andthe-.surface of said upper part, as small the exigencies of 40construction and-operation will allow.

The much desiredv eilectof maintaining a `zone of dryness andcleanliness is produced bymy device, the said zone being in this casethe surface of petticoat 3. Aiidlit is to'be understood the morenumerous the petticoats and the corresponding flanges of the lower part6, the more perfect will be the maintenance of the said zone at the lessaccessible parts of vthe insulator, and the greater the width thereof;

The operation of my device .t3 maintain y closing the bell-likeopenin iof the insulator.

adjacent surfacesof parts I and 6 through dust or cobwebs. Although pst'6 is shown 'its lower surface a self tothis exact construction. .Noi-'doI .confine `myself to .exact conformity between will in' a measureperform a li Having .described my invention `what1 Patent of the UnitedStates; is:v

Inan insulator, a in having its top frustof conical and threade for apart 4of the length of said frusto-'c-onical to a protecting .meinbermade of ali insu ating material and adapted to fit. tightly on the"frustoconical part o f the pin for the entire depth-of the saidcarrying insulating member having internal threads adapted to fit thethreadsof the in,` said wire-carrying .member having a s 'rt adapted toproject down into .the space -between the flange on the potectin member,said wire-carrying mem r also avi protectingmember. f

In testimony whereof I have hereunto signed my name in the prese'nccoftwo witnesses Y Litera-ARD'4 w. sToRRoR. -Vi/'itnessesz i FrLAY Coon,

- ALFRED J. HAaw'ooD.

as having ve the lowery lsurface o upper partj1,l1Ido-notconfnexmyprotecting member, said member also'havin'g an 'upwardlyprojecting flange whose outer. surface is a portion of a cone, and awire- .en outer skirt extending below the bottom o the the lines'ofpartQ and' art '1, since a` shield partly covering thel bell ke oeningofpa'rt 1f e function.`

claim 'as new and .desire to secure byLetters l'

